1. Firefox implements the PromiseRejectionEvent interface if you go to about:config and set the dom.promise_rejection_events.enabled pref to true. However, Firefox doesn't yet actually send the unhandledrejection or understand rejectionhandled events. Completing the implementation will be addressed in bug 1362272.

Desktop

Mobile

Chrome

Edge

Firefox

Internet Explorer

Opera

Safari

Android webview

Chrome for Android

Edge Mobile

Firefox for Android

Opera for Android

iOS Safari

Samsung Internet

Basic support

Full support
49

?

No support
No

Notes

No support
No

Notes

Notes Firefox implements the PromiseRejectionEvent interface if you go to about:config and set the dom.promise_rejection_events.enabled pref to true. However, Firefox doesn't yet actually send the unhandledrejection or understand rejectionhandled events. Completing the implementation will be addressed in bug 1362272.

No support
No

No support
No

No support
No

No support
No

No support
No

?

No support
No

Notes

No support
No

Notes

Notes Firefox implements the PromiseRejectionEvent interface if you go to about:config and set the dom.promise_rejection_events.enabled pref to true. However, Firefox doesn't yet actually send the unhandledrejection or understand rejectionhandled events. Completing the implementation will be addressed in bug 1362272.